what is thermometer and its type expl
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Answers
Answer:
A thermometer is an instrument for measuring or showing temperature (how hot or cold something is). One type of thermometer is a narrow, concealed glass tube containing mercury or alcohol which extends along the tube as it expands. Another type is a digital thermometer, which uses electronics to measure temperature.
Explanation:
A thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared model). Thermometers are widely used in technology and industry to monitor processes, in meteorology, in medicine, and in scientific research.
Some of the principles of the thermometer were known to Greek philosophers of two thousand years ago. The modern thermometer gradually evolved from the thermoscope with the addition of a scale in the early 17th century and standardisation through the 17th and 18th centuries
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The temperature of a substance refers to how hot or cold it is. Daniel Gabriel Fahrenheit invented the first thermometer, a mercury-in-glass thermometer, in 1714. All thermometers have a sensor that detects a change in temperature and a device to convey the temperature to the person reading it.
TYPES OF THERMOMETER ----->>>>>
•Manometric thermometer
This type is also known as a pressure-filled or vapour-pressure thermometer. It determines the temperature based on the change of pressure in gas or liquid. Manometric thermometers can be filled with gas (nitrogen), condensation (alcohol, chloromethane, diethyl), liquid (metals with low melting points, silicon liquids, metaxylene) or mercury.
•Liquid-in-glass thermometer This type is the oldest and most common kind of thermometer. It is used almost everywhere, and its principle of operation is very simple. This thermometer consists of a glass bulb and stem filled with a working liquid (alcohol or mercury) and an inert gas. When the temperature changes, the liquid expands or shrinks. When paired with a temperature scale, it is possible to use this occurrence to determine the temperature.
•Gas thermometer A gas thermometer determines the temperature based on the difference in pressure or volume of gas it is filled with. There are constant pressure and constant volume gas thermometers. The latter is more commonly used. Gas thermometer can be filled with any gas, but the most popular option is hydrogen. This type works best with very low temperatures.
•Bimetal (bimetallic) thermometer This is a mechanic thermometer that works with a bimetal strip. Bimetal means that it is made of two metals. The strip is sensitive to the change in temperature, and it causes mechanical displacement, which is used to determine the temperature. These thermometers are perfect for higher temperatures, as they become less sensitive and accurate at lower temperatures. They can be found in many household appliances like stoves.
•Digital thermometer Digital or electronic thermometers are one of the most recent developments in the thermometer field. Instead of using liquids or gases paired with a temperature scale, they have a digital screen, which can show you the readings in mere seconds. A digital thermometer has a thermistor that reacts to the change in temperature and projects the result on the thermometer screen.